Nikwax Cotton Proof is a safe, easy to use wash-in waterproofing for cotton, poly cotton and canvas. The Cotton Proof adds water repellancy while maintaining the breathability of the item by leaving a flexible water repellent treatment on individual fibres. The Nikwax Cotton Proof is used in the washing machine allowing the treatment to penetrate through the fabric forming a DWR which develops on air drying so there is no need for tumble drying.

Available in either a 50ml sachet or a 300ml bottle.